byMaryStewartbyMaryStewartCover,©MarioBeauregard/Corbis;p.3,©HarcourtTelescope;p.4,©TheGrangerCollection;p.5,©MikeRinnan/Alamy;p.6,©JohnChillingworth/HultonArchive/GettyImages;p.7,©RoyaltyFree/Corbis;p.8,©IvanHunter/Rubberball/Jupiterimages;p.9,©RoyaltyFree/Corbis;p.10,©EamonnMcGoldrick/Alamy;p.11,©ArnoldGold/NewHavenRegister/TheImageWorks;p.12,©SyracuseNewspapers/TheImageWorks;p.13,©StockbytePlatinum/Alamy;p.14,©Grace/zefa/Corbis.Copyright©byHarcourt,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingphotocopy,recording,oranyinformationstorageandretrievalsystem,withoutpermissioninwritingfromthepublisher.RequestsforpermissiontomakecopiesofanypartoftheworkshouldbeaddressedtoSchoolPermissionsandCopyrights,Harcourt,Inc.,6277SeaHarborDrive,Orlando,Florida32887-6777.Fax:407-345-2418.HARCOURTandtheHarcourtLogoaretrademarksofHarcourt,Inc.,registeredintheUnitedStatesofAmericaand/orotherjurisdictions.PrintedinChinaISBN10:0-15-350977-5ISBN13:978-0-15-350977-3OrderingOptionsISBN10:0-15-350601-6(Grade4On-LevelCollection)ISBN13:978-0-15-350601-7(Grade4On-LevelCollection)ISBN10:0-15-357930-7(packageof5)ISBN13:978-0-15-357930-1(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.1234567891098512111009080706Inventorsandtheirinventionscanbeveryfascinating!Inventorswilloftentinkerwiththeirinventionsuntiltheyareperfect.Inthisbook,wewillfindoutaboutsomeamazingwomeninventors.Womenhavebeeninventingthingssincelongago.Consider,forexample,theworkofHypatia.HypatiawasborninAlexandria,Egypt,intheyear370.Sheinventedtheastrolabe,atoolusedtomeasurethepositionsofthesunandstars.3Obviously,manywomenhaveinventedthingssincethen.SybillaMaster...
